diff --git a/pkgs/development/libraries/nanopb/default.nix b/pkgs/development/libraries/nanopb/default.nix
index a63d367b800..cafc5c85f21 100644
--- a/pkgs/development/libraries/nanopb/default.nix
+++ b/pkgs/development/libraries/nanopb/default.nix
@@ -50,6 +50,8 @@ in stdenv.mkDerivation rec {
       --subst-var-by python ${pythonRuntime}/bin/python \
       --subst-var-by out $out
     chmod +x $out/bin/protoc-gen-nanopb
+
+    cp ../pb_common.c ../pb_decode.c ../pb_encode.c $out/include/
   '';
 
   passthru.tests = {